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Re:Firefox 54: E10S-Multi, WebExtension APIs, CSS Clip-Path by hendersoon on Wednesday June 14, 2017 @06:13PM (#14556532)
Firefox 57 will no longer support XUL extensions at all. It's due to be released in November 2017.
Re:Firefox 54: E10S-Multi, WebExtension APIs, CSS Clip-Path by bwat48 on Wednesday June 14, 2017 @06:22PM (#14556579)
ublock is actively maintained, and afaik they have been working on a webextensions version, so I assume they'll be ready by then if not soon after.

In the meantime ublock works fine and is e10s compatible.